Surface modification of porous antireflective coatings for solar glass covers
Surface modification of porous antireflective coatings for solar glass covers
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DOI：
10.1016/j.solener.2010.06.009
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发表时间：
2011-04
期刊：
影响因子：
6.7
通讯作者：
G. S. Vicente;R. Bayón;N. Germán;Á. Morales
中科院分区：
文献类型：
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作者：
G. S. Vicente;R. Bayón;N. Germán;Á. Morales
纳米多孔二氧化硅膜通常富含残留的硅烷醇基团（Si-OH）。这些基团具有很强的反应性，并且在潮湿条件下会引起水蒸气和污染物的吸附，导致减反射（AR）膜的光学性质劣化等。这种吸附增加了薄膜的折射率，减反射特性消失。如果用惰性的有机硅基团交换活性羟基对膜表面进行改性，则可以降低表面膜的反应性，从而提高其性能的耐久性。在本文中，应用表面改性工艺，以增加膜的耐久性进行了研究。该过程通过将AR涂覆的玻璃浸入六甲基二硅氮烷（HMDS）/己烷溶液中来进行。接触角的测量表明，疏水性增加的HMDS的浓度和处理时间。在不同的光入射角下，研究了户外自然污染对薄膜透射光谱的影响。所获得的结果表明，对于相同的暴露条件，未涂覆的玻璃变得比AR涂覆的玻璃更脏。
The nanoporous silica films are usually rich in residual silanol groups (Si–OH). Theses groups are very reactive and induce the adsorption of water vapour and contaminants under humidity conditions, resulting in a deterioration of the optical properties of the antireflective (AR) films, among others. This adsorption increases the refractive index of the films, and the antireflective property disappears. If the film surface is modified exchanging the active hydroxyl groups by inert organosilyl groups, the reactivity of the surface film can be decreased and then the durability of its properties will be increased. In this paper, the application of a surface modification process for increasing the durability of the films has been studied. This process has been performed by immersing the AR coated glasses in a hexamethyldisilazane (HMDS)/hexane solution. The contact angle measurements show that the hydrophobicity increases with both concentration of HMDS and treatment time. The influence of outdoor natural soiling in the transmittance spectra of the films has been also studied, at different light incidence angles. The results obtained suggest that, for the same exposure conditions, the uncoated glass becomes dirtier than the AR coated glass.